libavformat/aiff.c

   1 /*
   2  * AIFF/AIFF-C muxer and demuxer
   3  * Copyright (c) 2006  Patrick Guimond
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/intfloat_readwrite.h"
  23 #include "avformat.h"
  24 #include "raw.h"
  25 #include "riff.h"
  26
  27 static const AVCodecTag codec_aiff_tags[] = {
  28     { CODEC_ID_PCM_S16BE,    MKTAG('N','O','N','E') },
  29     { CODEC_ID_PCM_S8,       MKTAG('N','O','N','E') },
  30     { CODEC_ID_PCM_S24BE,    MKTAG('N','O','N','E') },
  31     { CODEC_ID_PCM_S32BE,    MKTAG('N','O','N','E') },
  32     { CODEC_ID_PCM_F32BE,    MKTAG('f','l','3','2') },
  33     { CODEC_ID_PCM_F64BE,    MKTAG('f','l','6','4') },
  34     { CODEC_ID_PCM_ALAW,     MKTAG('a','l','a','w') },
  35     { CODEC_ID_PCM_MULAW,    MKTAG('u','l','a','w') },
  36     { CODEC_ID_MACE3,        MKTAG('M','A','C','3') },
  37     { CODEC_ID_MACE6,        MKTAG('M','A','C','6') },
  38     { CODEC_ID_GSM,          MKTAG('G','S','M',' ') },
  39     { CODEC_ID_ADPCM_G726,   MKTAG('G','7','2','6') },
  40     { CODEC_ID_PCM_S16LE,    MKTAG('s','o','w','t') },
  41     { CODEC_ID_ADPCM_IMA_QT, MKTAG('i','m','a','4') },
  42     { CODEC_ID_QDM2,         MKTAG('Q','D','M','2') },
  43     { 0, 0 },
  44 };
  45
  46 #define AIFF                    0
  47 #define AIFF_C_VERSION1         0xA2805140
  48
  49 static enum CodecID aiff_codec_get_id(int bps)
  50 {
  51     if (bps <= 8)
  52         return CODEC_ID_PCM_S8;
  53     if (bps <= 16)
  54         return CODEC_ID_PCM_S16BE;
  55     if (bps <= 24)
  56         return CODEC_ID_PCM_S24BE;
  57     if (bps <= 32)
  58         return CODEC_ID_PCM_S32BE;
  59
  60     /* bigger than 32 isn't allowed  */
  61     return CODEC_ID_NONE;
  62 }
  63
  64 /* returns the size of the found tag */
  65 static int get_tag(ByteIOContext *pb, uint32_t * tag)
  66 {
  67     int size;
  68
  69     if (url_feof(pb))
  70         return AVERROR(EIO);
  71
  72     *tag = get_le32(pb);
  73     size = get_be32(pb);
  74
  75     if (size < 0)
  76         size = 0x7fffffff;
  77
  78     return size;
  79 }
  80
  81 /* Metadata string read */
  82 static void get_meta(AVFormatContext *s, const char *key, int size)
  83 {
  84     uint8_t str[1024];
  85     int res = get_buffer(s->pb, str, FFMIN(sizeof(str)-1, size));
  86     if (res < 0)
  87         return;
  88
  89     str[res] = 0;
  90     if (size & 1)
  91         size++;
  92     size -= res;
  93     if (size)
  94         url_fskip(s->pb, size);
  95
  96     av_metadata_set(&s->metadata, key, str);
  97 }
  98
  99 /* Returns the number of sound data frames or negative on error */
 100 static unsigned int get_aiff_header(ByteIOContext *pb, AVCodecContext *codec,
 101                              int size, unsigned version)
 102 {
 103     AVExtFloat ext;
 104     double sample_rate;
 105     unsigned int num_frames;
 106
 107     if (size & 1)
 108         size++;
 109     codec->codec_type = CODEC_TYPE_AUDIO;
 110     codec->channels = get_be16(pb);
 111     num_frames = get_be32(pb);
 112     codec->bits_per_coded_sample = get_be16(pb);
 113
 114     get_buffer(pb, (uint8_t*)&ext, sizeof(ext));/* Sample rate is in */
 115     sample_rate = av_ext2dbl(ext);          /* 80 bits BE IEEE extended float */
 116     codec->sample_rate = sample_rate;
 117     size -= 18;
 118
 119     /* Got an AIFF-C? */
 120     if (version == AIFF_C_VERSION1) {
 121         codec->codec_tag = get_le32(pb);
 122         codec->codec_id  = codec_get_id(codec_aiff_tags, codec->codec_tag);
 123
 124         switch (codec->codec_id) {
 125         case CODEC_ID_PCM_S16BE:
 126             codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
 127             codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
 128             break;
 129         case CODEC_ID_ADPCM_IMA_QT:
 130             codec->block_align = 34*codec->channels;
 131             codec->frame_size = 64;
 132             break;
 133         case CODEC_ID_MACE3:
 134             codec->block_align = 2*codec->channels;
 135             codec->frame_size = 6;
 136             break;
 137         case CODEC_ID_MACE6:
 138             codec->block_align = 1*codec->channels;
 139             codec->frame_size = 6;
 140             break;
 141         case CODEC_ID_GSM:
 142             codec->block_align = 33;
 143             codec->frame_size = 160;
 144             break;
 145         default:
 146             break;
 147         }
 148         size -= 4;
 149     } else {
 150         /* Need the codec type */
 151         codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
 152         codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
 153     }
 154
 155     /* Block align needs to be computed in all cases, as the definition
 156      * is specific to applications -> here we use the WAVE format definition */
 157     if (!codec->block_align)
 158         codec->block_align = (codec->bits_per_coded_sample * codec->channels) >> 3;
 159
 160     codec->bit_rate = (codec->frame_size ? codec->sample_rate/codec->frame_size :
 161                        codec->sample_rate) * (codec->block_align << 3);
 162
 163     /* Chunk is over */
 164     if (size)
 165         url_fseek(pb, size, SEEK_CUR);
 166
 167     return num_frames;
 168 }
 169
 170 #if CONFIG_AIFF_MUXER
 171 typedef struct {
 172     int64_t form;
 173     int64_t frames;
 174     int64_t ssnd;
 175 } AIFFOutputContext;
 176
 177 static int aiff_write_header(AVFormatContext *s)
 178 {
 179     AIFFOutputContext *aiff = s->priv_data;
 180     ByteIOContext *pb = s->pb;
 181     AVCodecContext *enc = s->streams[0]->codec;
 182     AVExtFloat sample_rate;
 183     int aifc = 0;
 184
 185     /* First verify if format is ok */
 186     if (!enc->codec_tag)
 187         return -1;
 188     if (enc->codec_tag != MKTAG('N','O','N','E'))
 189         aifc = 1;
 190
 191     /* FORM AIFF header */
 192     put_tag(pb, "FORM");
 193     aiff->form = url_ftell(pb);
 194     put_be32(pb, 0);                    /* file length */
 195     put_tag(pb, aifc ? "AIFC" : "AIFF");
 196
 197     if (aifc) { // compressed audio
 198         enc->bits_per_coded_sample = 16;
 199         if (!enc->block_align) {
 200             av_log(s, AV_LOG_ERROR, "block align not set\n");
 201             return -1;
 202         }
 203         /* Version chunk */
 204         put_tag(pb, "FVER");
 205         put_be32(pb, 4);
 206         put_be32(pb, 0xA2805140);
 207     }
 208
 209     /* Common chunk */
 210     put_tag(pb, "COMM");
 211     put_be32(pb, aifc ? 24 : 18); /* size */
 212     put_be16(pb, enc->channels);  /* Number of channels */
 213
 214     aiff->frames = url_ftell(pb);
 215     put_be32(pb, 0);              /* Number of frames */
 216
 217     if (!enc->bits_per_coded_sample)
 218         enc->bits_per_coded_sample = av_get_bits_per_sample(enc->codec_id);
 219     if (!enc->bits_per_coded_sample) {
 220         av_log(s, AV_LOG_ERROR, "could not compute bits per sample\n");
 221         return -1;
 222     }
 223     if (!enc->block_align)
 224         enc->block_align = (enc->bits_per_coded_sample * enc->channels) >> 3;
 225
 226     put_be16(pb, enc->bits_per_coded_sample); /* Sample size */
 227
 228     sample_rate = av_dbl2ext((double)enc->sample_rate);
 229     put_buffer(pb, (uint8_t*)&sample_rate, sizeof(sample_rate));
 230
 231     if (aifc) {
 232         put_le32(pb, enc->codec_tag);
 233         put_be16(pb, 0);
 234     }
 235
 236     /* Sound data chunk */
 237     put_tag(pb, "SSND");
 238     aiff->ssnd = url_ftell(pb);         /* Sound chunk size */
 239     put_be32(pb, 0);                    /* Sound samples data size */
 240     put_be32(pb, 0);                    /* Data offset */
 241     put_be32(pb, 0);                    /* Block-size (block align) */
 242
 243     av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
 244
 245     /* Data is starting here */
 246     put_flush_packet(pb);
 247
 248     return 0;
 249 }
 250
 251 static int aiff_write_packet(AVFormatContext *s, AVPacket *pkt)
 252 {
 253     ByteIOContext *pb = s->pb;
 254     put_buffer(pb, pkt->data, pkt->size);
 255     return 0;
 256 }
 257
 258 static int aiff_write_trailer(AVFormatContext *s)
 259 {
 260     ByteIOContext *pb = s->pb;
 261     AIFFOutputContext *aiff = s->priv_data;
 262     AVCodecContext *enc = s->streams[0]->codec;
 263
 264     /* Chunks sizes must be even */
 265     int64_t file_size, end_size;
 266     end_size = file_size = url_ftell(pb);
 267     if (file_size & 1) {
 268         put_byte(pb, 0);
 269         end_size++;
 270     }
 271
 272     if (!url_is_streamed(s->pb)) {
 273         /* File length */
 274         url_fseek(pb, aiff->form, SEEK_SET);
 275         put_be32(pb, file_size - aiff->form - 4);
 276
 277         /* Number of sample frames */
 278         url_fseek(pb, aiff->frames, SEEK_SET);
 279         put_be32(pb, (file_size-aiff->ssnd-12)/enc->block_align);
 280
 281         /* Sound Data chunk size */
 282         url_fseek(pb, aiff->ssnd, SEEK_SET);
 283         put_be32(pb, file_size - aiff->ssnd - 4);
 284
 285         /* return to the end */
 286         url_fseek(pb, end_size, SEEK_SET);
 287
 288         put_flush_packet(pb);
 289     }
 290
 291     return 0;
 292 }
 293 #endif /* CONFIG_AIFF_MUXER */
 294
 295 static int aiff_probe(AVProbeData *p)
 296 {
 297     /* check file header */
 298     if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
 299         p->buf[2] == 'R' && p->buf[3] == 'M' &&
 300         p->buf[8] == 'A' && p->buf[9] == 'I' &&
 301         p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
 302         return AVPROBE_SCORE_MAX;
 303     else
 304         return 0;
 305 }
 306
 307 /* aiff input */
 308 static int aiff_read_header(AVFormatContext *s,
 309                             AVFormatParameters *ap)
 310 {
 311     int size, filesize;
 312     int64_t offset = 0;
 313     uint32_t tag;
 314     unsigned version = AIFF_C_VERSION1;
 315     ByteIOContext *pb = s->pb;
 316     AVStream * st;
 317
 318     /* check FORM header */
 319     filesize = get_tag(pb, &tag);
 320     if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
 321         return AVERROR_INVALIDDATA;
 322
 323     /* AIFF data type */
 324     tag = get_le32(pb);
 325     if (tag == MKTAG('A', 'I', 'F', 'F'))       /* Got an AIFF file */
 326         version = AIFF;
 327     else if (tag != MKTAG('A', 'I', 'F', 'C'))  /* An AIFF-C file then */
 328         return AVERROR_INVALIDDATA;
 329
 330     filesize -= 4;
 331
 332     st = av_new_stream(s, 0);
 333     if (!st)
 334         return AVERROR(ENOMEM);
 335
 336     while (filesize > 0) {
 337         /* parse different chunks */
 338         size = get_tag(pb, &tag);
 339         if (size < 0)
 340             return size;
 341
 342         filesize -= size + 8;
 343
 344         switch (tag) {
 345         case MKTAG('C', 'O', 'M', 'M'):     /* Common chunk */
 346             /* Then for the complete header info */
 347             st->nb_frames = get_aiff_header(pb, st->codec, size, version);
 348             if (st->nb_frames < 0)
 349                 return st->nb_frames;
 350             if (offset > 0) // COMM is after SSND
 351                 goto got_sound;
 352             break;
 353         case MKTAG('F', 'V', 'E', 'R'):     /* Version chunk */
 354             version = get_be32(pb);
 355             break;
 356         case MKTAG('N', 'A', 'M', 'E'):     /* Sample name chunk */
 357             get_meta(s, "title"    , size);
 358             break;
 359         case MKTAG('A', 'U', 'T', 'H'):     /* Author chunk */
 360             get_meta(s, "author"   , size);
 361             break;
 362         case MKTAG('(', 'c', ')', ' '):     /* Copyright chunk */
 363             get_meta(s, "copyright", size);
 364             break;
 365         case MKTAG('A', 'N', 'N', 'O'):     /* Annotation chunk */
 366             get_meta(s, "comment"  , size);
 367             break;
 368         case MKTAG('S', 'S', 'N', 'D'):     /* Sampled sound chunk */
 369             offset = get_be32(pb);      /* Offset of sound data */
 370             get_be32(pb);               /* BlockSize... don't care */
 371             offset += url_ftell(pb);    /* Compute absolute data offset */
 372             if (st->codec->block_align)    /* Assume COMM already parsed */
 373                 goto got_sound;
 374             if (url_is_streamed(pb)) {
 375                 av_log(s, AV_LOG_ERROR, "file is not seekable\n");
 376                 return -1;
 377             }
 378             url_fskip(pb, size - 8);
 379             break;
 380         case MKTAG('w', 'a', 'v', 'e'):
 381             if ((uint64_t)size > (1<<30))
 382                 return -1;
 383             st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
 384             if (!st->codec->extradata)
 385                 return AVERROR(ENOMEM);
 386             st->codec->extradata_size = size;
 387             get_buffer(pb, st->codec->extradata, size);
 388             break;
 389         default: /* Jump */
 390             if (size & 1)   /* Always even aligned */
 391                 size++;
 392             url_fskip (pb, size);
 393         }
 394     }
 395
 396     if (!st->codec->block_align) {
 397         av_log(s, AV_LOG_ERROR, "could not find COMM tag\n");
 398         return -1;
 399     }
 400
 401 got_sound:
 402     /* Now positioned, get the sound data start and end */
 403     if (st->nb_frames)
 404         s->file_size = st->nb_frames * st->codec->block_align;
 405
 406     av_set_pts_info(st, 64, 1, st->codec->sample_rate);
 407     st->start_time = 0;
 408     st->duration = st->codec->frame_size ?
 409         st->nb_frames * st->codec->frame_size : st->nb_frames;
 410
 411     /* Position the stream at the first block */
 412     url_fseek(pb, offset, SEEK_SET);
 413
 414     return 0;
 415 }
 416
 417 #define MAX_SIZE 4096
 418
 419 static int aiff_read_packet(AVFormatContext *s,
 420                             AVPacket *pkt)
 421 {
 422     AVStream *st = s->streams[0];
 423     int res;
 424
 425     /* End of stream may be reached */
 426     if (url_feof(s->pb))
 427         return AVERROR(EIO);
 428
 429     /* Now for that packet */
 430     res = av_get_packet(s->pb, pkt, (MAX_SIZE / st->codec->block_align) * st->codec->block_align);
 431     if (res < 0)
 432         return res;
 433
 434     /* Only one stream in an AIFF file */
 435     pkt->stream_index = 0;
 436     return 0;
 437 }
 438
 439 #if CONFIG_AIFF_DEMUXER
 440 AVInputFormat aiff_demuxer = {
 441     "aiff",
 442     NULL_IF_CONFIG_SMALL("Audio IFF"),
 443     0,
 444     aiff_probe,
 445     aiff_read_header,
 446     aiff_read_packet,
 447     NULL,
 448     pcm_read_seek,
 449     .codec_tag= (const AVCodecTag* const []){codec_aiff_tags, 0},
 450 };
 451 #endif
 452
 453 #if CONFIG_AIFF_MUXER
 454 AVOutputFormat aiff_muxer = {
 455     "aiff",
 456     NULL_IF_CONFIG_SMALL("Audio IFF"),
 457     "audio/aiff",
 458     "aif,aiff,afc,aifc",
 459     sizeof(AIFFOutputContext),
 460     CODEC_ID_PCM_S16BE,
 461     CODEC_ID_NONE,
 462     aiff_write_header,
 463     aiff_write_packet,
 464     aiff_write_trailer,
 465     .codec_tag= (const AVCodecTag* const []){codec_aiff_tags, 0},
 466 };
 467 #endif